Harvie and Hudson does bespoke shirts for (if I remember correctly) about 200 -- not cheap at all. I'm sure you can find some cheaper if you do some searching.
You can buy OTR and they will charge about ~15-20 to shorten the sleeves. One inch is doable, but three would probably not be. It would definitely be cheaper, and you could ask them to shorten each sleeve by a different amount if needed.

I walked into Tom's place a while back, enjoying a calm afternoon and looking for an outerwear coat. I left fumingly angry because of the sales staff hounding me incessantly. Seriously, it says something that they can ruin my mood on a nice fall day (*ahem* probably says something about both me and them...).
I don't know anything about Sydney's. Rego bespoke (Exchange Tower) is doing coppley MtM starting at $899, and according to them delivery times are about 6...

Harris tweed cloth is by definition made in the UK. OP, I suspect most jackets you find OTR will be made in China, including jackets sold in the UK. I have BB stuff that is labelled made in China, although I don't know about this particular jacket. I'm not sure what you have against China, but if you're so against buying something from there, go to a bespoke tailor and have them make you something in Harris tweed...

I've seen Rego advertise $899 for their MtM suits, although that advertised price normally means you have to add $2-300 for a fabric you would want. Hearing what you said about quality, I'm now tempted to go to Rego for a MtM suit. Hmm. Also, for MtM there is a dressmaker in North York (Chin Alterations & Tailor) that will order MtM from tailors in China and his prices are between $600-$1000, but I don't know what the quality is. He's about two doors down from Rosso's...

The price point certainly suggests pretty low quality. It's inconsistent in my experience. I have some TM Lewin that feel and look like nice shirting fabrics, and look brand new after 15-20 wears. Others look terrible after only 3-4 wears. Overall, I will buy from them again. If you like double cuff, Harvie and Hudson OTR might fit you quite well (my only real complaint for H&H is the sleeves are too wide). Regarding size, I am 40 chest and 33 waist, and slim fit TM...